黒崎 小夜

"Your dedication is simply obscene."

Skills: Getting under people's skin
Hobbies: Napping, teasing her "brother"
Likes: Box cutters, walks, peace and quiet
Dislikes: Men, any and all bugs, Christmas

The protagonist's "twin sister."

Seems cool and aloof, but actually just can't be bothered most of the time. Has mysterious powers like the protagonist. She shows up at the academy one day and becomes his classmate.

She'll say whatever comes to mind, often revealing her surprisingly lecherous side.